Radial arm type sawing device



June 5, 1951 A. N. EMMONS ,556,137

RADIAL ARM TYPE sumac DEVICE Filed Dec. 11, 1946 4 sheets-sheet 1 n N a;

INVENTOR. flrfiwr M Emma/7s June 5., 1951 A. N. EMMONS RADIAL ARM TYPE SAWING DEVICE 4 Sheets-Sheet 2 Filed Dec. 11, 1946 INVENTOR. firibur/V. Emmons Amp.

June 5; 1951 A. N. EMMONS 2,556,137

RADIAL ARM TYPE SAWING DEVICE Filed Dec. 11, 1946 4 Sheets-Sheet 3 31 E- E INVENTOR.

June 5, 1951 A. N. EMMONS 2, 6, 37

RADIAL ARM TYPE SAWING DEVICE Filed Dec. 11, 1946 4 Sheets-Sheet 4' Patented June 5, 1951 RADIAL ARM TYPE SAWIN G DEVICE Arthur N. Emmons, Nedrow, N. Y., assignor to Porter-Cable Machine Company,

Syracuse,

N. Y., a corporation of New York Application December 11, 1946, Serial No. 715,509

6 Claims. (Cl. 143 -6) This invention relates to a sawing device of the radial arm type. This type of device is mounted on the top surface of a work bench adjacent the rear edge thereof and has a guide, or arm, extending forwardly over the top of the bench and on which a power saw is slidably mounted. The work to be cut is laid on the bench and the power saw is moved laterally across the work, and is accurately guided by the arm, or guide rail, on which the saw is slidably mounted. Usually the guide rail may be moved about a vertical axis to out work at an angle, and the saw is movable about a horizontal axis, whereby work may be cut at a compound angle.

This invention has as an object a radial arm type sawing device which is particularly economical to manufacture and which, accordingly, can be sold at a price materially lower than the price of such devices now available on the market, and which embodies a structure by which the height of the saw guide from the bench may be quickly and conveniently adjusted by the operator.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figures 1 and 1A, joined together, constitute a side elevational view of a sawing device embodying my invention.

Figures 2 and 2A, joined together, form a top plan view of the structure shown in Figures l-lA.

Figure 3 is a front elevational View of the power saw supporting carriage.

The device comprises a base It of substantially rectangular form and adapted to be mounted upon the top H of a bench, or the like, as by means of screws I2. The base is formed with a circular portion 13, the periphery of which is beveled, as indicated at M.

A support I5 is mounted upon the base and is formed with a circular portion It, the periphery of which is beveled, as at H, in the opposite direction to the bevel M on the base. The support is adjustably clamped to the base by semi-circular clamp members it which encircle the beveled edges 84, ll, of the circular portions l3, [6, of the base and support. The clamp members 18 are contracted into engagement with the circu-. lar portions l3, [6, by screws [8 and 20. The screw 29 may be provided with an operating handle2l.

With this construction, the support I5 may be. rotated on the base H! and clamped in any adjusted position by the clamp members 18. The circular portions 13, It, may be provided with alined tapered apertures to receive a tapered locating pin 23 for quickly locating the support so that the transverse movement of the power saw will be perpendicular to a stop or guide 24 mounted on the bench top H and which serves to position the work piece 25. Additional apertures 25 may be provided to position the support so that the movement of the saw will be in angular relation to the work stop 24 to effect angular cuts on the work.

The support I5 is in the nature of an upwardly extending column bifurcated at its upper end to receive a bearing block 38 in which a screw 3| is journalled. The block 30 is journalled on trunnion pins 33 secured in the support. The screw is held against axial movement in the block- 38 by a collar 34 secured to the screw on one side of the block, and an operating handle 35 secured to the screw on the opposite side of the block. A bracket is pivotally mounted at one end to the support and extends rearwardly therefrom. The saw guide is pivotally mounted by pin 52 to the rear end of the bracket and is movable about said latter pivot toward and from the bench top H. The bracket is in the form of a yoke having side members 37 connected intermediate their ends with a transversely extending portion 38. The forward ends of the side members 3? are spaced apart to receive the support column l5, and are apertured to receive a pivot pin 39 extending transversely through the support and held in place by nuts 49 threaded on the ends of the pin.

The rear end portions of the side members 31 are flared outwardly and apertured to receive a pivot pin 42. The saw guide consists of a pair of spaced apart tubular members it, the outer ends of which are provided with a transversely extending cross member 455 which eerves as a convenient handle for raising and lowering the saw guide toward and from the bench.

A bearing member 45 is secured to the inner end of each of the tubes 44, and these bearing members are apertured to receive the pivot pin 42. additional cross member 4? is secured on the guide rails 44 and is positioned in front of the support I5 and in proximity thereto.

The saw guide is yieldingly urged upwardly from the bench by a tension spring 48, the lower end of which is secured to a pin 49 extending through the cross member 41 and secured thereto as by nut 50. The upper end of the spring is disclosed in Patent No. 1,848,330;

7 connected to a lever pivotally mounted at one end to'an angle bracket 52 secured to one side of the support column, as by screws 53. A notched bracket 54 is secured to the opposite side of the column, as by screws 55. The free end of the lever 5| is inclined slightly and provided with a beveled edge 51 for engaging the notches of the bracket 54, the purpose of the lever 5| beingto vary the tension on the spring 48, as will be ap-' parent.

The rail supporting bracket is formed with an arm 60 extending upwardly from the pivotpin 42 and in angular relation to the side members 3'! of the bracket, and rigidly secured to'the cross member 38 by a projection 61. A is journalled in the upper end of the arm 60 on trunnion pins 63. The nut is threaded internally to receive the screw 3|, and with this structure the bracket is adjusted about the pivot 39 by op' erating the crank handle 35 and thus the pivot 42 is raised, or lowered,- to adjust the heightof the" guide rails 44 relative' to the bench top'l I, this adjustment being made'to permit work of different thicknesses to' be sawed.

Thesaw consists of a housing 61 enclosing a motor suitably connected to an arbor 68 o'nwhi'c'h asaw blade 691s mounted. Themotor housing- B1; is supportedby an arcuate bracket Tli secured to a-platell which, in turn,- is secured to a carriage 12, The sides-of the carriage are provided with bearings 73" ap'e'rt'ur'ed to slidably receive the guide rails-4'4; lhe motor housing i's adj'u'stable on the arcuate bracket to change the' arrgular relation between the saw arbor G8 and the bench top, and issecured in adjusted position by a thumb screw 14'. This structure is more fully The motor housing is provided with a suitable handled? by which the motor and the carriage T2 is reci'pro cated on the rails 44. a The structure described is economical to'build and'light in weight. The height of the guide rails 44 is conveniently adjusted by the operating handle 35, whereby the guide rails are maintained in substantially horizontal position: during the sawing operation regardless of the thickness of the work;

The spring 48' maintains the saw guide rams" upwardly in spaced relation to the bench to p, which permits work to be conveniently placed upon the bench.

In operation, the operator grasps the cross 7 member 45 with one hand and lowersthe guide to horizontal position and, with the other hand} moves the saw along the guide transverselyflo f the work. After the sawing operation is completed, the device returns to the upward position by the action of the spring 481' What I claim is:

1. A sawing device comprising a support" adapted to be mounted on a bench and'ex'tendi'ng" upwardly therefrom, a bracketmounted at one end to said support on a horizontal pivot and'extending rearwardly therefrom, a saw guide mounted on the rear end of said bracket on-a horizontal pivot and extending forwardly over the bench and being movable vertically toward and from the same, manually'operable means for moving-said bracket about its pivot-on sai'd s'up port to adjust said guide pivot vertically, means" coop-erable with said support and guide to yi'eld ingly urge the guideupwardly from the bench, a" carriage slidably'mounted on said guide, was

power saw detachably'secu-red to said carriage;

2. A sawing device comprising a suppbrt members secured at their rear adapted to be mounted on a bench and extending upwardly therefrom, a bracket mounted at one end to said support on a horizontal pivot and extending rearwardly therefrom, said bracket being provided with an upwardly extending arm, and manually operable means cooperable with the support and said arm to move the bracket about its pivot, a saw guide mounted on a horizontal pivot to the rear end of said bracket and extending forwardly of the support and being movable vertically toward and from the bench, m'eans-yieldingl-y urging said guide about its pivot upwardly from the bench, a carriage slidably mounted on the guide, and a power saw detachably secured to said carriage.

3. 'A sawing device comprising a support adaptedto be mountd on a bench top and extending upwardly therefrom, a bracket mounted at one" end to said support on a horizontal pivot and extending rearwardly therefrom,'a saw guide mounted or'i the rear end of said bracket on a.

horizontal pivot and extending forwardly over the bencha-nd being movable vertically toward and'from the same, manuallyoperable means for moving said bracket aboutits pivot on said sup; port-to adjust said guide pivot vertically, yielding means cooperable with said guide to urge the,

atoneend on said support on a horizontal pivot in proximity' to' the bench top and extending rearwardly from said support, a saw guide mounted on the rear end ofsaid bracket 'on' a horizontal pivot and extending forwardly over the bench, said bracket being provided with an upwardly extending arm, screw means cooperable with the upper ends'of said'support and'said arm and being manually operable to move said bracket aboutits pivot on the support, means yieldingly' urging" said saw guide about its pivot upwarqzllyfrom the bench top, a carriage slidably mounted on the guide, and a power saw d'etac hably securedto the carriage.

5, A sawing device comprising a support adapted to" be mounted on a bench top and extending upwardly therefrom, a yoke mounted at one end to said support on a horizontal pivot and extending rearwardly" therefrom, a pair of guide end of sa'i'dyoke on a" horizontal pivot and extending forwardly n parallel spaced apart relatio'nship over the bench top, a carriage slidably mountedon-said guides, and a power saw detachably secured to said carriage, means'yieldingly ui 'gin'g saidguides' upwardly from the bench top, anddiianually operable means for moving said yoke about its pivot on'said support.

6.- A" sawing device comprising a, support adapted to be mounted on a bench and extend ing upwa-rdly therefrom; abracket mounted at" oneend to said support on a horizontal pivot" and extending rearwardly therefrom, manually operable means cooperable with said bracket for moving the same-about its pivot on the support, a pair-of gui'de'members mounted'to the rear end of said biacket'on'a' horizontal pivot and exteii'ding forwardly in parallel spaced apart rela tionship over the benchtop, a carriage slidably mounted upon said guide'members, a powerfsaw',

ends to the rear 5 and means oooperable to detachably secure the Number front end of said power saw to said carriage. 1,529,303 ARTHUR N. EMMONS. 1,836,457 1,848,330 REFERENCES CITED 5 1,852,387 The following references are of record in the 2,306,512 file of this patent: 2,367,551

UNITED STATES PATENTS Number Name Date 10 Number 555,649 Marshall Mar. 3, 1896 136,657 1,457,492 Bloodgood June 5, 1923 'Name Date Drucker Mar. 10, 192-5 Emmons Dec. 15, 1931 Emmons Mar. 8, 1932 Wieden Apr. 5, 1932 Whitney Dec. 29, 1942 Emmons Jan. 16, 1945 FOREIGN PATENTS Country Date Great Britain Dec. 23, 1909 

